| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 11 |
10.7%
|
| 0 | No time was spent | 14 |
13.6%
|
| 1 | 5 |
4.9%
|
|
| 2 | 4 |
3.9%
|
|
| 3 | 3 |
2.9%
|
|
| 4 | 2 |
1.9%
|
|
| 5 | 12 |
11.7%
|
|
| 6 | 1 |
1%
|
|
| 10 | 12 |
11.7%
|
|
| 14 | 1 |
1%
|
|
| 15 | 11 |
10.7%
|
|
| 16 | 1 |
1%
|
|
| 20 | 10 |
9.7%
|
|
| 25 | 1 |
1%
|
|
| 30 | 3 |
2.9%
|
|
| 35 | 1 |
1%
|
|
| 40 | 1 |
1%
|
|
| 50 | 4 |
3.9%
|
|
| 52 | 1 |
1%
|
|
| 60 | 3 |
2.9%
|
|
| 63 | 1 |
1%
|
|
| 80 | 1 |
1%
|